Stop motion device



Aug. 8, 1939. P. J. THOMAS 2,169,170

STOP MOTION DEVICE Filed Jan. 7, 1958 4 Shets-Sheet 1 Inventor jxT/a gy 2mm W 14% Attorneys 8, 1939- P. J. THOMAS 2,169,170

STOP MOTION DEVICE Filed Jan. 7, 1938 4 Sheets-Sheet 2 Afforneus Aug. 8, 1939. P. J. THOMAS STOP MOTION DEVICE 4 Sheets-Sheet 5 Filed Jan. '7, 1938 :Hforncus Aug. 8, 1939. P. J. THOMAS STOP MOTION DEVICE 4 Sheets-Sheet 4 Filed Jan. '7, 1958 jg}, (Q

fJT/zamaa 4 Horme /s Patented Aug. 8, 1939 UNITED STATES PATENT OFFICE .STOP MOTION DEVICE Application January 1, 1938, Serial No. 183,896

ZCIaims.

This invention relates to twisting machines, such as twisting machines for silk and rayon fibres; and more particularly the invention has reference to an improved stop motion for such type of twisting machines.

An object of the invention is to provide an improved stop motion which will be accurate and dependable, and will operate to make certain parts of the twisting machine inoperative when the thread, as the result of being twisted, breaks.

A further object of the invention is to provide for the mounting of a take-up spool in such a manner that the weight of the spool will not be carried by the drive roll but will be supported entirely independently of the drive roll.

A further object of the invention is the maintenance of a uniform pressure between the takeup roll and the take-up spool, with the amount of pressure being varied as may be found desirable.

A further object of the invention is to provide means for the enlarging of the take-up spool and the maintaining of the proper relation of the traverse guide as Well as for the disengaging of the take-up roll, the take-up spool, and the traverse guide when the thread, as a result of being twisted, breaks.

The invention together with its objects and advantages will be best understood from a study of the following description taken in connection with the accompanying drawings wherein:

Figure 1 is a front elevational view illustrating the application of the invention.

Figure 2 is a side elevational view with certain parts shown in section, and also illustrating the application of the invention.

Figure 3 is a horizontal sectional view taken substantially on the line 3-3 of Figure 1.

Figure 4 is a fragmentary detail view partly in section and partly in elevation showing the manner of supporting one end of the take-up roll of the twisting machine.

Figure 5 is a perspective view of a guide member.

Figure 6 is a perspective view of a drop-wire.

Figure 7 is a perspective view of a guide roller and supporting arm therefor.

Figure 8 is a fragmentary detail elevational view of the drop-wire and lock-out cam, and associated parts.

Figure 9 is a top plan view of the assembly shown in Figure 8.

Figure 10 is an elevational view of a slightly modified form of traverse guide.

Figure 11 is a side elevational view of the modified form of traverse guide, and

Figure 12 is a detail view, partly in section and partly in elevation of a hand treadle for use in the place and stead of a foot treadle as hereinafter made manifest.

Referring to the drawings more in detail, it will be understood that I shall refer only to such parts of the twisting machine as deemed necessary for a proper understanding of the invention. Thus referring to the drawings by numerals it will'be seen that the reference character I indicates a spindle which carries a bobbin 2. The spindle I is rotated by a belt 3, driven in a conventional manner, and supported by the idler pulley 4. The spindle l is suitably J'ournaled on a casting 5, which latter is mounted to swing in a horizontal plane, the pivot being indicated at 5' and a lug 8' is secured on the casting 5. A foot pedal 6 is carried by a rod I normally urged upwardly by a spring 9 and is pivotally and slidably connected to a pivotally mounted lever 1, as shown at 8. The lever engages a lug 8' on the spindle, whereby on depressing of the foot pedal, the spindle I will be disengaged from the drive belt 3 and engaged with a brake H for temporarily stopping the spindle in order that the bobbin may be taken OS or a broken thread repaired.

The thread 12 as it releases from the bobbin 2 travels upwardly through a guide eye l3, over a guide roller l4 and through a drop-wire l5, and then through a traverse guide I 6, winding on the take-up spool H.

The take-up spool I! is rotated by the frictional contact therewith of a drive roll I 8. The drive roll I8 is mounted on and driven by shaft l9 at a predetermined speed.

The traverse guide It is swingably mounted in a bracket 20 which in turn is attached to and mounted on a traverse bar 2|. The traverse bar 2| oscillates through a given stroke through the medium of means including a cam (not shown) and in so doing acts in conjunction with the traverse guide l 6 in building up a parallel thread formation on the take-up spool ll.

As is believed obvious, while the thread I2 is running in the machine the tension of the same supports the drop-wire l5. This drop-wire I5 is suitably attached to a bracket 22 which is mounted on a shaft 23 to swing about the shaft as an axis. The shaft 23 is mounted on a gate 24 which swings on a pin 25. The pin25 in addition to forming a hinge for the gate member 24 serves to attach the gate 24 to a housing 26.

Attached to the gate 24 is a latch 21, and the latch 21 extends over the shoulder 28a of a plunger 23, holding the plunger rearwardly against the action of a spring 29. Attached at the extreme left of the aforementioned plunger 23 is a casting 33 that serves as an anchor for one end of a spring 3|, the other end of said spring being attached to an extension 32b of a yoke 32. Yoke 32 is slidably mounted on a pair of parallel rods 33, the yoke 32 being provided with parallel sleeves 34 which accommodate the rods 33 in a manner suggested in Figure 2.

As shown, the yoke 32 rotatably supports the take-up spool IT. The take-up spool I1 is mounted on a shaft the ends of which are loosely journaled in openings provided therefor in the standards or arms of the yoke 32. At the upper ends thereof, and as clearly shown in Figure 4, the openings 32a provided in the arms of the yoke 32 for receiving the shaft of the spool H are, at their outer sides, closed by suitable plates Ila.

From the above it will be apparent that at the instant the thread I2 breaks and tension is released the drop-wire l5 will fall causing the bracket 22 to rotate downwardly, the bracket 22 swinging about its axis provided by the shaft 23. This downward swinging movement of the dropwire I5 places the bracket 22 in the path of a projection 35 attached to the aforementioned oscillating traverse bar 2|. When the projection 35 on the bar 2| strikes the projection 22 of bracket 22 the aforementioned gate 24 is caused to swing outwardly thus releasing the latch 21 from the shoulder of the plunger 28. Plunger 28 being now released travels to the right under pressure of spring 29. As the plunger 28 moves to the right collar 36 on the plunger 28 engages the depending portion 32b of the take-up spoolcarrying yoke 32 as will be clear from a study of Figure 2 with the result that the spool I1 is caused to move away from and out of contact with the drive roll l8. Also, as the take-up spool ll moves in the direction indicated it forces the traverse guide l6 also to the right until said guide is disposed over the vertical pivot center of bracket 20, at which time the traverse guide falls free of the take-up bobbin.

To reset the stop motion mechanism all that is necessary is to reposition the guide l6 against the take-up spool and hold up the drop-wire l5 and push in plunger 31 until tension occurs again on the thread which has been repaired. In this connection it will be noted that the plunger 31 is connected with the plunger 28 and by pushing in the plunger 31 as just indicated yoke 32 and associated parts will return to normal position under spring 3 I, while plunger 28 moves inwardly so as to engage the shoulder 28a thereof behind the latch 21.

In the starting and stopping of the machine, the drop-wire i5 is in a downward position since at that time the thread should be running slow with very little tension. In order to hold the drop-wire IS in running position without the aid of the thread tension, a lock-out motion is provided and serves to so hold the drop-wire in running position during the stopping and/or starting of the machine. This lock-out motion con sists of a cam 33 mounted on a rod 39, and the rod 39 is slidable by suitable means but not shown.

As will be clear from a study of Figures 8 and 9 when cam 33 on rod 39 moves from the position shown in Figure 9 towards the left to the position shown in Figure 8, the cam 33 contacts a projection 40 provided on the aforementioned bracket 22. Engagement of the cam 33 with the projection 40 will cause the bracket 22 to rotate and raise the drop-wire l5 carried by the bracket 22. In this way the drop-wire I5 is held in position until the machine stops or comes up to the speed desired as the case may be.

In Figure 12 is illustrated a hand-operated device, therein indicated by the reference numeral H, and which is adapted to be used on the top deck of the machine to replace the foot pedal 6 for use in applying a braking action to the spindle. The hand-operated element 4| embodies among other parts a plunger or dog 42 that serves to hold the element 4| in stop position allowing the hand to be removed from the plunger. In this connection it will be understood that dog 42 will engage a suitable projection provided on the spindle mounting bracket or casting 5.

Referring to the modified form of guide as shown in Figures 10 and 11, it is provided with a substantially rectangular shaped open eye l6 through which extends the thread and a shank H which is received in the bracket 20.

It is thought that a clear understanding of the construction, utility, manner of operation, and advantages of an invention of this character will be had without a more detailed description.

Having thus described the invention what is claimed as new is:

1. In combination with a twisting machine having a bobbin for furnishing thread to a takeup spool and a frictional drive for the spool and a reciprocal thread guide for guiding the thread from the bobbin to the spool, a yoke slidable on said machine and supporting the spool for movement into and out of engagement with the drive, spring influenced means acting on the yoke to disengage the spool from said drive and manually actuated to engage said spool with the drive, latch means coacting with the spring influenced means to releasably secure the latter in the manually set position, a drop wire means connected with said latch means and engaging the thread and supported in a selected position by the thread and adapted to assume a second position on the breaking of the thread, and means on said guide to engage the drop wire means when in the sec ond-named position to actuate the latch for releasing of the spring influenced means to bring about disengagement of the spool from the drive.

2. In combination with a twisting machine having a bobbin for furnishing thread to a takeup spool and a frictional drive for said spool and a reciprocal thread guide for guiding the thread from the bobbin to the spool, a yoke slidable on said machine and supporting the spool for movement into and out of engagement with the drive, spring influenced means acting on the yoke to disengage the spool from said drive and including a manually actuated device to permit engaging of said spool with the drive, latch means coacting with the spring influenced means to releasably secure the latter in a manually set position, a drop wire journaled on the machine and con nected with said latch means for the operation thereof and engaging the thread and supported in a selected position by the thread and adapted to assume a second position when released by the breaking of the thread, and an extension on said reciprocal thread guide to engage the drop wire when in the second-named position to actuate the latch for releasing the spring influenced means and thereby bring about disengagement of the spool from the drive.

PACIFIC J. THOMAS. 

